Time

1. Time Formats

Time can be expressed in different formats:

12-hour format: Uses a.m. (before midday) and p.m. (after midday).
- Example: 8:00 a.m. (morning), 8:00 p.m. (evening).
24-hour format: No a.m./p.m. Used in timetables, digital clocks, and schedules.
- Example: 20:00 = 8:00 p.m.

Hundred Hours Format

Used in the military and aviation.
The colon (:) is replaced with "h".
- Example: 20:00 is written as 20h00.

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Worked Examples

Worked Example 1: Converting Between 12-hour and 24-hour Format

Convert the following times:

3:56 p.m. → 15:56
4:49 a.m. → 04:49
2:45 p.m. → 14:45
10:25 a.m. → 10:25
7:35 p.m. → 19:35

3. Converting Units of Time

Time conversions:

60 seconds = 1 minute
60 minutes = 1 hour
24 hours = 1 day
7 days = 1 week
365 days ≈ 52 weeks = 12 months = 1 year

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Worked Example 2: Converting Time Units

Convert the following times:

140 seconds into minutes and seconds:

140 ÷ 60 = 2 minutes and 20 seconds.
Answer: 2 min 20 sec.

138 minutes into hours and minutes:

138 ÷ 60 = 2 hours and 18 minutes.
Answer: 2 hrs 18 min.

4. Activity: Converting Hours to Days and Hours

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Worked Example 3: Converting Hours to Days and Hours

Train journey takes 34 hours. How many days and hours is this?

34 ÷ 24 = 1 full day and 10 hours left.
Answer: 1 day 10 hours.

Flight to China takes 38 hours. Convert to days and hours.

38 ÷ 24 = 1 full day and 14 hours left.
Answer: 1 day 14 hours.

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